Fresnel-dual-lens-unit-based visible light communication receiving antenna design method

A technology of visible light communication and design method, which is applied in the field of achromatic Fresnel double lens, can solve the problems such as the decrease of the light concentration ratio of the receiving system and the uneven distribution of light concentration on the surface of the detector, and achieve the improvement of the light concentration ratio, light weight, small size effect

Inactive Publication Date: 2015-01-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] In order to solve the problem of using a Fresnel single lens for beam convergence, the uneven distribution of light on the surface of the detector caused by material dispersion, resulting in a decrease in the light concentration ratio of the receiving system, thus proposes an achromatic Fresnel double lens

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  • Fresnel-dual-lens-unit-based visible light communication receiving antenna design method
  • Fresnel-dual-lens-unit-based visible light communication receiving antenna design method
  • Fresnel-dual-lens-unit-based visible light communication receiving antenna design method

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Embodiment Construction

[0014] The working band of the visible light communication system is in the spectral range from 380nm to 780nm.

[0015] For a single Fresnel lens, light of different wavelengths will converge on different positions on the detection surface after passing through the lens. Let λ m , lambda M are the minimum and maximum wavelengths of the incident spectrum, in order to collect all the convergent rays on the detector, the focal length f(λ M ), f(λ m ) as close as possible. The ideal position of the detector should be at λ m , lambda M At the intersection of the marginal rays, such as figure 2 shown.

[0016] The light concentration ratio of the receiving system is affected by two factors: one is the dispersion of the material, and the other is the F number of the lens. For the dispersion of materials, due to the inherent properties of materials, different wavelengths have different refractive indices n(λ), and short-wavelength beams converge earlier than long-wavelength ...

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Abstract

The invention provides a Fresnel-dual-lens-unit-based visible light communication receiving antenna design method. According to the method, a reflection Fresnel lens is used as a main optical assembly; and the organic glass PMMA (polymethyl methacrylate) and a PC (polycarbonate) are used as component materials for forming the Fresnel lens. The innovation points of the method are as follows: the Fresnel lens is used for replacing the traditional single refractor; the whole receiving system has advantages of small size, light weight, and low batch production cost low; the structure is simple; and the system can be installed in the indoor space easily. The provided method can be applied to the visible light communication receiving field.

Description

technical field [0001] The invention relates to a Fresnel double lens concentrator applied in a visible light communication receiving system, in particular to an achromatic Fresnel double lens. Background technique [0002] Visible light communication is a new optical wireless communication technology developed on the basis of white light LED technology, which has the advantages of high transmission power and no electromagnetic interference. In the downlink channel of visible light communication, the receiving antenna should first have good light collection performance, so it is necessary to design a corresponding optical receiving system, but the traditional lens is difficult to meet the size requirements and limitations of the receiving antenna. [0003] Compared with conventional lenses, the use of Fresnel lenses on the light-receiving antenna of the visible light communication system can reduce the cost, reduce the thickness of the lens and the receiving focal length. F...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/04G02B3/08H04B10/116
CPCG02B1/041G02B3/08H04B10/116
Inventor 蓝天李湘倪国强
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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